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Data as of Nov 7, 2026

51.56.0.0/14

No anonymizer space

Microsoft Corporation · space held by Microsoft Limited

Announcement
this exact prefix
RPKI valid
Announced by
AS8075
Type
Hosting

Registrations in this block

The registry's network records over the announcement: those covering it, widest first, then every record inside it, under its parent.

RangeAddressesNetnameHolderTypeCreatedAbuse contact
51.54.0.0 - 51.59.255.255393,216UK-MicrosoftMicrosoft Limited (ORG-MA42-RIPE) · GBLEGACYOct 6, 2016abuse@microsoft.com
└ 51.58.0.0/1665,536cloudunknownLEGACYSep 5, 2025abuse@microsoft.com
via UK-Microsoft
└ 51.59.0.0/1665,536cloudunknownLEGACYSep 5, 2025abuse@microsoft.com
via UK-Microsoft

A contact marked “via” is the registry's: the record names none of its own, so the registry hands down its parent's.

Network & registry

AnnouncementRouting historyRPKI & IRRWhois & abuse
Origin network

AS8075

US
Name
Microsoft Corporation
Type
Hosting
Registered
Mar 31, 1997
Domain
microsoft.com
Website
www.microsoft.com
Industry
Software Development
Spamhaus ASN-DROP
not listed